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What can cause an SCF2 on the ATV61 and ATV71 drives?
Altivar ATV61 and ATV71
Motor short circuit or grounding at the drives output.
Check the motor wires and motor insulation with a 1KV megger (make sure the motor is disconnected from the Drive)
Check your motor for proper grounding.
Check your drives switching frequency adjust if needed.
Check your auto diagnostics mode and run the Transistor test.
Consider adding a load reactor, dv dt motor filter or Sinus filter if you have a long motor cable run between the drive and the motor.
Try running the drive open circuit without the motor leads connected at 20hz, 40hz, and 60hz check the output voltages at each stage to see if the voltages are balanced.